sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo cp sources.list /etc/apt/sources.list
sudo apt-get update && sudo apt-get upgrade
pip3 install -r requirements.txt -i https://pypi.douban.com/simple/
pip3 uninstall opencv-python
pip3 install opencv-contrib-python
sudo cd ~
sudo cd .local/lib/python3.8/site-packages/
sudo cp -r PyQt5/Qt/plugins/platforms/* cv2/qt/plugins/platforms/
sudo rm /lib/x86_64-linux-gnu/libQt5XcbQpa*
sudo apt-get install python3-opencv
sudo apt-get install xchm

